1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  */
   4 /*
   5  * Licensed to the Apache Software Foundation (ASF) under one or more
   6  * contributor license agreements.  See the NOTICE file distributed with
   7  * this work for additional information regarding copyright ownership.
   8  * The ASF licenses this file to You under the Apache License, Version 2.0
   9  * (the "License"); you may not use this file except in compliance with
  10  * the License.  You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20 
  21 package com.sun.org.apache.bcel.internal.classfile;
  22 
  23 
  24 import  com.sun.org.apache.bcel.internal.Constants;
  25 import  java.io.*;
  26 
  27 /**
  28  * This class is derived from the abstract
  29  * <A HREF="com.sun.org.apache.bcel.internal.classfile.Constant.html">Constant</A> class
  30  * and represents a reference to a Double object.
  31  *
  32  * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
  33  * @see     Constant
  34  */
  35 public final class ConstantDouble extends Constant implements ConstantObject {
  36   private double bytes;
  37 
  38   /**
  39    * @param bytes Data
  40    */
  41   public ConstantDouble(double bytes) {
  42     super(Constants.CONSTANT_Double);
  43     this.bytes = bytes;
  44   }
  45 
  46   /**
  47    * Initialize from another object.
  48    */
  49   public ConstantDouble(ConstantDouble c) {
  50     this(c.getBytes());
  51   }
  52 
  53   /**
  54    * Initialize instance from file data.
  55    *
  56    * @param file Input stream
  57    * @throws IOException
  58    */
  59   ConstantDouble(DataInputStream file) throws IOException
  60   {
  61     this(file.readDouble());
  62   }
  63 
  64   /**
  65    * Called by objects that are traversing the nodes of the tree implicitely
  66    * defined by the contents of a Java class. I.e., the hierarchy of methods,
  67    * fields, attributes, etc. spawns a tree of objects.
  68    *
  69    * @param v Visitor object
  70    */
  71   public void accept(Visitor v) {
  72     v.visitConstantDouble(this);
  73   }
  74   /**
  75    * Dump constant double to file stream in binary format.
  76    *
  77    * @param file Output file stream
  78    * @throws IOException
  79    */
  80   public final void dump(DataOutputStream file) throws IOException
  81   {
  82     file.writeByte(tag);
  83     file.writeDouble(bytes);
  84   }
  85   /**
  86    * @return data, i.e., 8 bytes.
  87    */
  88   public final double getBytes() { return bytes; }
  89   /**
  90    * @param bytes.
  91    */
  92   public final void setBytes(double bytes) {
  93     this.bytes = bytes;
  94   }
  95   /**
  96    * @return String representation.
  97    */
  98   public final String toString()
  99   {
 100     return super.toString() + "(bytes = " + bytes + ")";
 101   }
 102 
 103   /** @return Double object
 104    */
 105   public Object getConstantValue(ConstantPool cp) {
 106     return bytes;
 107   }
 108 }